Remove some non-determinism

[licaon-kter]

Your app is not built reproducible in F-Droid, but we continuously test older versions on https://verification.f-droid.org/ and would like more and more apps to become repro

Looking at the latest app report: https://verification.f-droid.org/packages/de.blinkt.openvpn/

We can remove the build id by adding this to the cmake file

and the timestamp diff block will be fixed on our side once https://gitlab.com/fdroid/fdroidserver/-/merge_requests/1653 gets merged

[schwabe]

Do you have any documentation on these options? And does everyone Android that uses native code need them? I understand the reason but I would to understand a bit more the background of these changes.

[licaon-kter]

https://cmake.org/cmake/help/latest/command/add_link_options.html

https://reproducible-builds.org/docs/source-date-epoch/#cmake

https://f-droid.org/docs/Reproducible_Builds/#cmake

And does everyone Android that uses native code need them?

maybe, not sure I understand the question 😄